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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3711452a5393b36762bc44cccfc095c0aebcd5c99f59d71c7a4863eb9f342c5b' 
  AND token = '6BeJ4BJD/zcIplRD8VL5PamrLhvOjeHSzL5tC+lym1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}